The outputs of the clock-calendar are the binary-coded decimal digits that represent the date and time
in 24-hour (“military”) format. Each digit is encoded using four bits, so eight bits are used for each of
seconds, minutes, hours, day, month, and year. For example, the date/time 7:34:25pm on December
17, 2014, is represented by 14/12/17 19:58:25 = 0001 0100 0001 0010 0001 0111 0001 1001 0101
1000 0010 0101
Look like you have to design a BCD counter. How? Read a book on digital logic design or ask Google ;-)
I tried to write some code, find the example in attachement.
It increments up to the days, does not yet increment the month and the year.
The reset on line 31 is still wrong, as it resets the day to zero, and not to one. (you need to correct this.)
There may be of course other bugs in the design.
Have fun coding and simulating !.
There are many ways you could design. Select which ever is comfortable to you.
First, using only bcd counters.
2digit second bcd counter. The "carry" of the second digit triggers the 2digit minutes counter. ans so on.
Second, use binary counters and bcd converter for every field: sec, min, hour.
Attached is a clock circuit without the calendar. You could easily extend the circuit. This has bcd counters and 7seg converter.
It is working. Some features like set and alarm can be added.The master clock has to have period of 1sec,
regards,
T.Arivoli
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